Case-hardening or cementing material.



sTA'rEs ATENT non.

HUGH new, or ri'r'rssune, PENNSYLVANIA.

GASE-HARDENING on CEMENTING MATERIAL.

949,4,48. No'nrawlng.

Specification of Letters Patent. Patented Fe'b. 15, 1910.

Application fiIed May 21, 1909. Serial No. 497,555.

rial No. 496,271, filed on or aboutMay 15,"

1909, that the ordinary coke of commerce when pulverized or granulated and inti-v mately mixed with proper proportions of an energizing substance, such as lime and sodaash, caustic soda or barium carbonate, has the property given to it of rendering it ac-- tive as a casef-hardenin or cementing material. By energizing su stance, I'mean such material, not necessarily carbonaceous material, as will when addedto an inactive carbonaceous substance, render such carbonaceous substance active, as a carbonizing agent. It is. difficult, however, in the case of insoluble substances to get and maintain the 1nt1mate m1xture necessary, and in the case of soluble substances it is diflicult to get enoughof the substance into the pores of the coke. I

I have found that I am able to-obtainintimate mixtures of coke and energizing substances, such as lime, soda-ash, caustic soda or barium carbonate, or mixtures thereof, by m1x1ng the proper proportions of-energizing substance with coking coal, preferably finely powdered, and then heating the mixture. at a temperature suflicient to coke the coal. The result-is an impregnated cokewhich maybe crushed and screened to the size desiredfor commercial case-hardening-or ceinenting material. In appearance the resulting, product closely resembles non-ini pregnated coke, but, however, it is' a little softer and will absorb moisture more rapidly.

I have found that, if desired, case-hardening or cementin may be carried on durin the process of'co 'ng the mixture of coal and energizer and the resulting product may later be crushed and screened for use as a commercial case-hardening or cementing material and a parently has all of the properties it woul' have hadif the case-hardening or ceinentinghad not been carried on during tlie coking operation.

I have found in practice that excellent case hardening or cementing material may ten parts by weight be produced by inixin ve parts of powdered of owdered lime and so a-ash with one hundred parts of slack 5 coking coal and then subjecting the mixture to a temperature of about 1500 Fahrenheit until the coal is thoroughly coked. I have also found that an intimate mixture of lime and coke may be obtained by coking the mixture of slack coking coal and lime-stone. hen this is done the lime-stone obviously is changed to lime, and the resulting product is coke nnpregnatedwith lime. Lime-stone, prior to being calcined, is not useful as an energizing'su -stance because of its surfaceattacking properties. I have also'f ound that other coking materials than bituminous coalmay be used and I have obtained excellent results from crude oil andthe heavy hydrocarbons resulting from the distillat on of crude oil.

Having thus described my invention,-what Iclaimis:

1. The method of producing cementing or case hardening material which comprises coking a mixture of coking material and a substance which after the coking has energizing properties.

2. The method of producing cementing or case hardening material wh1ch comprises coking a mixture of coking coal and a sub-H stancejwhich; after the coking has .energ1zing properties.

3. The method of producmg cementing or case hardening material which compnses coking a mixture of ,coking mater1al and energ1zing substance.

4. The method of producing cementing or case hardening material which comprises coking a mixture of coking coal and energiz-L ing substance. p 5. The method of producing cementing or case hardening material which com rises coking a .mixture of "coking'materia and soda ash. 6. The method of case hardening material which comprises coking a mixture of coking material, soda ash and limestone. Y 7. The method of producing cementing or producing cementing or case hardening material which comprises coking a mixture of coking coal and, soda ash.

8. The method of producing cementing or case hardening material which comprises coking a mixture of coking coal,- soda ash and limestone.

9. Cementing or case hardening material containin a coked mixture of coking material an a substance which after the coking has energizing properties.

g 10. Cementin or'case hardening material containing a co ed mixture of coking coal and a substance which after the coking'has energizing properties.

11. Cementin or case hardening material containing a co ed mixture of coking macontaining a coked mixture terial and energizingvsubstance.

12. Cementing or case hardening material.

containing a coked mixture of coking coal and energizing substance.

13. Cementing or case hardening material ofcoking material and soda ash.

14. Cementing or case hardening material contamm 'a coked mlxture of cokmg material, soda ash and llmestone.

15. cementing or case hardening material coking coal In testimony whereof, I have hereuntosubscribed my name this 12th day of'May, 1909. i

- Witnesses: v

' C. W. MOGHEE,

Gno. O. WALKER.

HUGH RQDMAN. f i 

